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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63192bb03dec849c3231a64348cf0bb2f5dac1a8163cd2222f2ef4fd1d737327' 
  AND token = 'Plm/5b0g+/mFOxUxBs/PPhcq/bddssh5xmGe2PqKLu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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