SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9796e48aadd6cffaf82c4707901633e581b5b7749d13246365cf4289c6b5cca5' 
  AND token = 'lHhpoG79K8QHTL8vB1Dkx+hY63g2cLuTYDnh1WhRlOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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