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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '322b7977b7736bb735d04a352c0e4e4b1a6a99e99f1578d6f7e906632f088adb' 
  AND token = 'a7O6KFZg+LGcivlKKFxbu2ylpFZoNcsao7MRzPcbW7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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