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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dda1e08fda379f39c9abd614ceda331c27e529c8159cb952190444b075500bf' 
  AND token = 'p343zxlU6uJYrwHB7JYdJiLnW6jdNJPSQQPfNiNijVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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