SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9965695e4634895dcb7225d91d0344fdbf2a3ead677b73c7ac532ba2190f0cec' 
  AND token = 'ZBPC/JMPGjWwU+rb2ToQNB4FaqycxNr3qlpzS5JWnpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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