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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4cd1fc954b20f1f469f8dfcaedcfd4d040bb90118dc315fdf98818ed979a77d' 
  AND token = '10swFYFsJVNdsfALkREMVzc5CF8JoHRjBA1IOKh8gE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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