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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05ade7df04f3f26002eb7ca272283ec0c436d42a9dac6cb3649f56e72152ccac' 
  AND token = 'sWzYnbZBkBOghKOLZSDN0ny4dvoi4i8Dc6V6jH5YlOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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