SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '925f06e71a1ea303d1964615d7f11fb9e24ba8cdf222ba308e3cac4c379ce5f4' 
  AND token = 'obco/thgKxYLX+itJIAUj/6EpapCi8Tj6gf+4zw53xY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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