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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46ff64ac35d2bcef07922977304a84f41fd95c93f4773cb82718eec1268e36c2' 
  AND token = 'ch2IX0t4kjxXeYNMvNjEsxvi5SrekE/pVE/TxbdYU54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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