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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98f7152140a042c247eefaba1dc7b71c79b4731b79e72aef662a16ebaf6f8196' 
  AND token = 'gScZP1tKf9qmXOnOAmK5s7HFgQplQTwn7G9tSQBJKWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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