SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '416cdfeb4271383d2e392c5c888f0df6a1565484d9c51e02feda7a39537ff4aa' 
  AND token = 'qqGihbRjxWzswpDp9tJKb/1jEU9xzcfuuog4MqgQqwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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