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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99ddb066b05edda8c395e1e2ab4c2e6c47f55f0100f607210b31d52ce8ab5232' 
  AND token = 'VhGQ1tY9kdsVeICqrGiplnChc8mRzlDZpUjqyzY6TxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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