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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3eb8c30569af39097fc15547b9d2985da804c8bba366424f8b4a71ac7b9134b4' 
  AND token = '1/vWRApOQRTbS5xqLETjE1Iyjs26X8DRJfxo4wV+OuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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