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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '034029cf281cce4eecbc05bc3f37358a8f8eba5d14d00db3173ea15726200475' 
  AND token = '9RrW+TfeupdmD90KHKbnQndX3HbNYLzfWcJHUjJKFC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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