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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15ad773fea6ac1da89a8cc3c0a43b5cb634cdefeae3d1936558c9995fc5f60e5' 
  AND token = 'ltDrcS2vH0Vw/RIdbIXEjQ66jc09Olg5kYU/6w2x3dI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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