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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '285705f9ab2126c10624708dc343be49e0257ec55875667c820d14da95f5c210' 
  AND token = '/ykHAN8OHt+OgrrrdhDfKkXgqEyNA9y32xrydvnBUMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00104

JSON explain

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