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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dacd0d28952d0c16b1cab13b143dc7c794c46c66c2d9072b7d88c73732cc7049' 
  AND token = 'Dn9mtf8ByCp5OqbLe2WM967Ujzu2Wu+NvgoI/fnVWAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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