Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfa4f18c45ee57b871a15300a0c21ec4da39ca3d64d9194c9ccc9b04f6e2fa5c' 
  AND token = 'yNuz44TqVkun+8V9jffLtxcyvP7Y+aCrTyg67v6dlI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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