SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edb5ab3afb5ae59422906e7fa72155c8103b3c8e808d1722ff472d375fa44279' 
  AND token = 'BQd2g5B/93QjT3kwZwo+/1zQqeMsAohh5c2/ePVKKAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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