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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5de5fef6959338fe24f294b1db693cfc4ca389d7976975c90edb0011447560ee' 
  AND token = '2egjaEh0lFbDUcOf9cOnlUl5BS6OZ5k/l0emKy1H/H8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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