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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b2790e5e252941349f48467e999b39913db88a2def6ec62a610dec785b33676' 
  AND token = 'wd2y2/yDrxyysgZZ8ePwglNRKGQL3QJPIrx/a5OWQ08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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