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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08e3eb79d8c9ef88f8403a1284883907cd8c9c1dadb31a4a9ec715c809fae818' 
  AND token = 'AfnI0IrSRH6jTY4AHEz8xYxs2RX17MsghTXYewn0SPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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