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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88a7fb57199982c07f5b84d97c9fed9a3795ff7ce2d91e86b63abedaf18392c5' 
  AND token = 'gWIly6f33WSY0GX0KlraPA9u4/9C5BXozC4SoxKmCfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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