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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f930e1a8e280ea782839c1d9948fb90807d2a630ad57c6a7066125c4cbd62584' 
  AND token = 'RtcBIs9e9Dj+vMEaXc2cotmYt7DlSX5r5fOb4+2UcKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00253

JSON explain

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