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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f0174eeb7474f6892bf58a43defd85f745bd3ad187ff65be9513f66ba7bced2' 
  AND token = 'l3XLHBtYXbYAxCnaF4Jx++Exd9XtwSNpnHkGm/0cAjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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