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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff068bf091bbf676d7ecc120cf69ef327ef067ef6d481e4139d8b9706fc81b56' 
  AND token = '7ZigdbuznFz7P/m4x+h8KmwnVPp01PnqGOXRVsAfCXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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