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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b87ea5bf681eb2ed61192cc92a4d1e43bf536f36e2e8d2997daa2dff5853b55' 
  AND token = 'HJ/t5/q9kQ4ld7/i/6zUlgajv8IUrFTrPHduDBpfdws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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