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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15695436c4aaee29907cc39518ecec3c606511f9a9acc77201258a1062b6018c' 
  AND token = '39pOBfp6ea4kzGdRPTHG7bXMq1rG30xWQFqESCk+Fk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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