SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f985f3664ce587bf5b9dd00f9f76f5853143c68e9ab7b7c1e4ce9df941cf69c' 
  AND token = 'TcKDCDyMOyxloYIoP1g0dFpvIpkX2mXb+eKRnszZJGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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