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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cd9afc4d6d91e5cb9b86575e0778886c7895792ded4b7dadcff7490ac4be883' 
  AND token = '6tcTsBVoW0hajwiEbLCucuOEBZ5anZ07wlkT9VJVgXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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