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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2771e108a5baae0ee6db78731ea93954add5b1416c6bfba509697c2dcaf6d508' 
  AND token = 'TgtiQL98abCtkMTVtbj8inFSDp4PpTzdr0MKRu+2wmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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