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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75c51dd65cd4b447e73c261a96d179415ca2be64a81cf5b9a2a4a7758a0adb5c' 
  AND token = 'xag13nAyN4lw/3QZOeSWcXTP8T5wBgw5r+VjVMJLHdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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