SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f0c80c533111d4b52c180b82c9c42a6f0417ecb54ad18c625e409332d4dc4e4' 
  AND token = 'bAUlNMi2K7xYufCigmzsWJhNS0bzLYHgz+iXB/kjV9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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