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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fcde2c7d4098cdc52b295759c57fc3888a165b3f9e7551406b46dae1ffb6832' 
  AND token = 'Kp5IxfEYg5s4iRftBf8IL7801DlOrDqwWbj2ZFiP7mU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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