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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca16a3615a413ca688fbe49d6c0d9831b035e5af8cbdeae0dcd701ac570b3c4d' 
  AND token = 'pggywESJHuFJPfoJNhooUq0LVUSff8W8JI74INSjgl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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