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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '821ecc46d8a4f96b48b42d9e7271162ba0e123407fc08f19db6ac023aec21c06' 
  AND token = 'euXKox4fuLzvFe1+E2SyVeDx4GBdKE6MdbWI6PI/WdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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