SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e73b58a5b1c9614e9f59cfa7984f273ce56b899b2669838f55c888e3bc5dff8e' 
  AND token = 'UfUsFeHezrauPHZkjC+vpKWBPo8C6SWHvVvPZ7weqfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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