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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16e6c8b932ddf8446ca50b1180d34440300f0d5f8fa6462c5fdab66111e1225a' 
  AND token = 'LUQSDUNvYIoaCUrR9LP8xYjsUpvRwxasoTu4BKfeI04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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