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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f4664278be0f52415d6708e2a269346b46c3d931d896a5d49e2e4286066c6e0' 
  AND token = 'cybkJrqsmc86TS+def9U2YwFmNtyeS2inqiga0444ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}