SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a33f1fab15269738196817fe869a6de9e3f64a15ce38d8b3230930f178481094' 
  AND token = 'IasYuWSkVtdAwszoXMLhJHc3KYj5COGOmBmEcfSVew4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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