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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fe87d2abf95baa57537a48598c0f3b7326209ad7dedda1885055639730c0864' 
  AND token = 'hamWQ9ONtKV0cr70idyGtYBDByAWl4NO45/1WEIQfw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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