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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca66a4c524e54bf008d66389048f47779e5e3b99a55551a9519547953759ae02' 
  AND token = 'l1VbDfSe654ZZi5nVy/mlF7CLOdByBibIQw1eilUA18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00095

JSON explain

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