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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '609baa50f857373d022118743b616b04c02f380868ca22ac8490041617724990' 
  AND token = 'LYpVcszn+m1etxJ0XkxwNAXpFTrb4Iuxm2Hr//WKvXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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