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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ec064ead977f1d0c6739283331dc148ae80c2cb56663fe2b6fc1f1cd9504a81' 
  AND token = 'bxOm+LSQk4ukwhM8JpfuDJd4co2f7WbY735B3M/+ztE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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