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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba0d222847f98eb49bc76cbec2fe46c9953199438002e7c472cadb0f204d77e3' 
  AND token = 'OHyjyPnCCcVbdj6sT9GZpLy/iEpXCMwTrVf0BXTk7CY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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