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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf2222f6ae705b9577d3557c8457599aa7c48c7ae25cf68c9905e6a9a9e91998' 
  AND token = 'QPXGafJR55cHhuuDnK4t8BI5MRHtwo2JMzMkM8tEbvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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