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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3c0e6dbb6117948eec5b9a98567df47ad1c0099ebbb36e96af51dd58b28d7e7' 
  AND token = 'riaP99YOTlzFHq8m6GmTHxntDD6IAg26EnDj/wLi0Oo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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