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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15adc141b4705b72868b3a2a6ea69d07e248a8a4641867dcb03d0e5d621438c4' 
  AND token = 'NvQFc4n9mUmGWVpQdmVHiivzqxwmQcDp+emlB7kr3U4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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