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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1180395b741d879af6c824ac7af83d09ca4ce010173458b317a43b1d437d96b0' 
  AND token = 'IUr6677bkLG4EbimeVIvKgF8kvcEiavGdQHINOxFELA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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