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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5f7f46739d55a53254042dd178f043093f8ddb2071e7f30ac0e0883b08944fc' 
  AND token = 'HOEHwah5ZKzzK06XfNYvGUA0wt5vwDBy8hlwID7SvWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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