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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0aa46d1a2c0376569f6395cd3f4fe9a4453dff2fa39344b8a43f88eeb99f16b6' 
  AND token = 'e+WXufF27LJ+Hmi0OSjI0uI6W/hqLCOKpc3zcJ0mYm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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