SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f677e9a2b383dc6d24fddbfe35f53286184e62a412805f6cd46253d015574944' 
  AND token = 'P/guzf63wNGBCuezq79sFBSj4TrIAjiQCtdbkCvucWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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