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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1277e94082b44be3c16cb179b2c0ce014311e8374cd5e94178b70b44fc4198e3' 
  AND token = 'PrG3xD6o8k13QH5fKf+oyXyxgegRba1ZrE+diCq5Q5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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