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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0234c4de4f1028a83238cd7b4d17fcf02f1c347bc057ff2b5f4137a03cae732' 
  AND token = 'C86lh5s6Y1BmZuR/+spRWRZuLqoe+97Rzz5qeHh5WSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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