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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc898cd1347b86ef1594e00b847de885b81803182485f011852097d4c82eca54' 
  AND token = 'c6w7tKD11BJ8Xsn4Hu4Z+jylDw7GrlyzSdexsilIghM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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