Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88d633e499dad92319885182d5b551233d366bd8c87deee7a831d919b935d50f' 
  AND token = 'jKSFdhOjkaktcZkgEqA/IQu0egkjY8N+sWBaP3lWzXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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