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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dac5d6ca4b8c16f1589b1f60a9e286f75c8621271e4b81955c8c62b4e00c5a21' 
  AND token = '81qletl9fYF0Lr25RxZDZL17zrJhaDpZLqOGbMk+4pQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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