SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5db253c38072eb5a1c831238c9237905f9ee71b07e9a6e507355419b897b2828' 
  AND token = 'XBAjBAbVTxy+RNXjlXtViLdz+QzFTKYnUzJFAg3l/K4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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