SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a090017ab83b7e85fb1051c42e5df304952ae6da91e4c8a638f19cd96aa2863e' 
  AND token = 'Uw1WYzdReaXO/N42TrP3URCAK6CJVL64g8Z2Ssyhl2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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