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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a67aaf0a4ff711f2ab709db141141f1be6b073b394f5ae7bb0c66d241c7beffb' 
  AND token = '1aNHqpmBYS6Wq0LbKtrMrU/XVjOnyesGK9c9xD6VeXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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