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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd234ac1043890ad155b8a1a0ee6d7dbf9e3f5760c23dbfafdd87c0f22d84f6cb' 
  AND token = 'riZNHbTvhAtsYakSsotmZb1eQ61jbz/FxzZhHD7mdNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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