SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6990983481c11233931db2fd5609db857cf4326920ebc987e5429413be41c04d' 
  AND token = 'gATcUNOankGBXUzZ+gWaWqaFBCa8yY88UHWn/hPsuSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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