Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '621f756b83515a3b37e10c2c9fbb677c2b72a9a4b43394c1e5d846b8584e8bdf' 
  AND token = 'cRpDm0TUs97JnhOCIFpxSAxMF9O7Ycr5xmf/TDqz9c0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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