SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b964cba3bbf75e5d206f2b5c13a8d21a0b98e483c458399a4d41a373bbe00009' 
  AND token = 'e4CtYJ6tYcmjmK0vuqhdItDrOlZIawwnHqJ6Tg5sxUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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