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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a144cadbd794713624796c03dc1513450cd0f46846e3e6292a2daca60ca894d1' 
  AND token = 'W2G6GjBoboxk8dAd2Lba01Q7zki65UoqJ4e9cYDtgE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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