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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa8fe91062d04edcaf32d1d24416e76c2a3a4f378ae3218ac2aac7480b5c9af0' 
  AND token = 'xeFCVyCnRtN93NLXlq/hEPj8ezlb7FK3GpnjmnsdTf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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