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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93d205697abe8be6f43071aedddaceddc282d0821603804528c12bcdd125dd37' 
  AND token = '2lWR1L+YdFG71trlXf5HRq96tYyd294tLIuCADu/zXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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