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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02b00f61a2dcb0f5ab9e3435732b3b13f17a40399a8c008cfa40a1eef8d93687' 
  AND token = 'BdSMQhal7mTh++yE4aahZ0ZI3qpUB2W/58iI6NVc4Ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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