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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '957bc9847c43d429c064654ebe4009053b8fbc5d057261a1ddc1772083e9126b' 
  AND token = 'j16fdDWXvYJ4uZDX9D2GD935QTLjKSFc7T6/xwWIhOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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