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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad3b946f2ed193533fe294188f904e6074e5dafcb8493b3c9dd52676cba9b03c' 
  AND token = 'YNxMhP1DIQT0zKVWuGM+5kKQRdQhVLgng98FdflT6sI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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