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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9dbabd02f6879b84d4ff28a210551cab3dfac8b04a03d7b6924165d74f8c8a5' 
  AND token = 'rhPuVE1LkGZGwpP0KRcnSPPxFnc7NFfn85V8xEW8cok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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