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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9013d30e1b2acd01b41e155b7fd4d91c9545344e57c1abb832eaf636653c71e2' 
  AND token = 'Y1xx4eb1PnMT/1QMkSf5V/jB+c4iJsSa+niOyZiSD1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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