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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96ab30cffcb0eb90384b068857d3feadf51ff4fe1e23e5dedd93d8e3accded13' 
  AND token = 'HeCogkh7M5hmOYs3lg0Os83v1W6Xx9RFspP/EAi7B7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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