SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2684a1fa4eba0d7432b3113d63cd4125d9667a704be9d57c47fed317294892e4' 
  AND token = 'TMBjvsiyeBtES1ljwxZcKqqH8/Vuq1DEzEJvc8z8Zy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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