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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf877490484d085d7eaaa455498cb08c361313b1043c9d7a91136eac4300e9f7' 
  AND token = '8YArqQjtbNVE5B/8/dTG1ZXG/F22OdcNcoDXxSL69HA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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