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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '663e76e3704a8eb24b6a88de3e75e26ff4aa43e237a5a525b14d6296267526ff' 
  AND token = '2BUJ3gYIoExcGEBDJr4emws4CbfXdFLEcWAbe4vv3fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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