SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09808a83b868e19fde84022a795b33a63853cd62a585d059ed7831c1fbf59c4a' 
  AND token = '47A/UNK3HOi4/x/JYY7gVHpsJTAj8m1jWrpci7lGBbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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