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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3d816d6c395c7a8f568391ee60f63f05cb5868c6bd6de1a1bd8169ffb64553c' 
  AND token = 'Togg5Wb0r4l2X0lePPnlzKb2npcgimzw54pp1Mfq95E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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