SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc658f28296f6f3f5bdc6ad1c091d258fe919db9126c8a7b77b51747ffefbd34' 
  AND token = 'QJgq7eF3wKyUWhYB8WD73PhH9Q6loWNl+DdIjhppTzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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