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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b14e7bb211c38877bf2ce983952b4b1ebab4ec8c8e4beead4813c46d17f0dee5' 
  AND token = 'Hq5YKCqajFQI7Wca8cmr711IOrwCFN0IN1PCY6so1S8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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