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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a583ae8596809e68cd28a01b491bd28ae06a1c38c2dc054cbe0d43738ac36318' 
  AND token = 'cNWs3HETmG9KYtOh8Q0pp5G+A8d/Eo8EYzUvNRdRByU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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