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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4c2c635e1fafd1b9bb6f0ee3e1eadd7cecf5b4aca68fd44ec1cf4d660c75382' 
  AND token = 'z9hxh3Jpa7mNT+qAO6+8GdKVXHcAEUN+rrqMP3ZdlTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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