SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fbfad4f0a22028829a418ca02c00c4452a6801515330fdf52dd6ceea6681331' 
  AND token = '/EV69RuVmRViHLCv6hChvjBxuOFOp7lozQ4HUp5yY8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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