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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32ac4c8cd95a6a3250ad932bc8e5858ce9bf562133976f9e831962e6015f7415' 
  AND token = '4hGXp0GDIln6UungnYntV8+BfJhYt0N1fVDld3nucak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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