SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd98418c3048aaf4b1bf468abfa1951e652cd16fc121a5e5c74029e25ef9f0a61' 
  AND token = 'JFTMHn/wd/ONzY5PDOzDQKTqVz8WI/hqc0EnGjBFH0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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