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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba90a6b5ee6b741e6d2a3e537de0d67a2f6596364e54b6b7e61d9ecaee2ed229' 
  AND token = 'Lsn+zqUdU3aKlO9LeVdMsdHQlbW2mgXxTf8UK5q9AfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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