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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14c5a8b6034e00bc60cbbbc173c14e93cc201b726bae7d0affa49edb50776cca' 
  AND token = 'FLOjSTC+KixI0tHFhEWOGaNt6wvJnOLbYiVHIezGY5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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