Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bf1b2ca45284d9f6ce80b6a9a6b6e9d8f3818f2d39ac934c1faf8537248f315' 
  AND token = 'IMj1AQ2PBUbyLXRHu7+c9yggBO1MkFr4fHcYIibNk5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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