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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9fb565007fca84637ff4c7c4dae881285afc4589217f8e0ef1b644af88acea0' 
  AND token = 'Mv/FxcBsxzabxPb5zY3BCD230VJA2BhfmFn9ViPMuM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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