SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d2ca5ffd38460b41603b51655527932e34ad388f1769a8c036fb727d055587e' 
  AND token = 'DLvYce8F/3KsElTjVWt306uwzbKZpX1j/yrdqOSJNsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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