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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33b16ba99530f2e707f904f0469f6f5e35fa70c0cbb3666dd217fe54f32fec6c' 
  AND token = 'r5D4GVXW5pHUB3b9HGT+TjcKHPb79gY6WrwlU/sHWBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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