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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d3483fe56bec2a667f0a5cbf52ca306b4e039650ff51e61b4de874298bf64e1' 
  AND token = 'YTCTrAPFm1AZx8Quw6vu4UFb39Yd3yR7Nms9Phu9avQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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