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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fc11de1dbf3dd3d36e765ff89d7af232314030adef5da3edfb9cd396c1fb7c0' 
  AND token = '+vvg121Pj67mqo7vRxZp3z/tJRiqFT6gXlCFpiJROtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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