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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dcb3df579c70f630d556f41a6204f2719c21b87a1028a43b1400a50bd3dcc68' 
  AND token = 'r5Cblh3tdyvVqirb0GVfIMgRClF+cg1Y12jIzd1hveQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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