Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfb3adf01b5c799da5e4dfa925c14d61d8a7b4b29d925ad8d637305d0d2cbac5' 
  AND token = 'lMQfitOV+b3ed+JZs7kR4JZAhOdAYarwNhLRY3d1q3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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