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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e1f1cd3fd9185108ed9a41c9c26dc5a4f3cef19591b7d9ec10babd79a7f58c2' 
  AND token = 'vy7q0l6PmJz55tgm4IpafdEo1W76iHZpRIYiiG6rCSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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