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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47c403728a6d957219939760b5e56a3e4e13a8e061312087fd37f920f3942b25' 
  AND token = 'bMzX76OiwbEbBKzd0/ez6JPDrGo34GfJP3lsc08XoF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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