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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a646c89b576dac428059b49ebc6b7e222ed93a0c4f58427cdb6238d705b7eb5' 
  AND token = 'lfnR8bORD1B4hmrDJE25XvR4G8NlgUDExqjMYuzWot4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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