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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50e69963b5cbf3aa18a457eadcb9baab7a53c2195411fe26fe218afbe9eef4ec' 
  AND token = 'hnMmS5fMojen4zesgqjeLdwqA9onBYc/xhLp5KmyzOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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