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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d5803b25500b9d81812b1bd631df1226c5f95f9fe4a3ada87cedd9fde70263f' 
  AND token = 'j2JDhyh1WtcmoPl7ldyR70XV4qPG5ysGHYCKoXhH5y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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