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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fe5a2eae68bfea45ca188a8264cc4f61dc0fce746e05e65f50f5e0e7e16a3bb' 
  AND token = 'hLp9cb5dB3TgPxHe6vTqO8Ek36/vdFwtx2agfLvz4GI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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