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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d9c1341e97549f1ec9e67f120376739b0f027ed282e9ece637b518f467cd616' 
  AND token = 'QE0LOLlIWqh3byZpQzE91JhkA7q0LF80mL1PXoNR6gw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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