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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '042c51423d70d0fb89541ab5abb54517d2e7ecbd3730b22ef575521bfd6bf0ad' 
  AND token = 'NEaPHrPi+t5MjcRTxan03UO9nzdXBkZAgL6F84XNSFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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