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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7724d63bc1cfbc43f7edcdaf54384aea2c554c03df8dbc7ceb7dbd9217152499' 
  AND token = '45rlT6Jb+OnB72NNOBqivK9Ui42jgg/WZYSmivyzdqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

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