SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '650ab36df7e9580778693a4c017b46d32fc665fe6089478cd63de135997bf8df' 
  AND token = '9t6OXBGCKDyFDfsQo8ngRi2diVqHUvfRNYhlgjVsPj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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