Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '881d251a8777b8c28753f67fb2a724d5d8ae878c7370f4126474b61b0e25ebd5' 
  AND token = 'k2axgHHgI/DJvT1unp89NCV2uins/+6KIQWuj075EDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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