SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48c39e8c3873504ea6a04dd164bfa47f5024ca3def6da2e3fdfb83267641abaf' 
  AND token = 'RPynVEgv1FQFHDE7NTLRr5JVTCXZzTBhqd/THc08wso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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