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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c76e5ea6c72b8cce00c3c951d0c7e1c6fd23e4e8fe0ff3edcc1094373407b12' 
  AND token = 'wRFuyhLjMbNmKMsDO+/xczjEBdU5fv5zzOYVgaxLzQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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