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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '745c6e7ce2157be91cd56b7d0c6db6f5848829af138bf810ff38cafbba3396b1' 
  AND token = '2PCLpe8mZlhNE2dLvdwUUyMS/f46mHPEyn8leMzCaos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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