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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cefbead8569634c655f3fd2c2aec4d7159ea685761ccb36cd8bffda0009b5f6f' 
  AND token = 'qBUwEGiP0Mh6ZmQIImVd8Z82+c2yavu0WxMkj6mu2VM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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