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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d9e268f98392513e786e90d78d166be36acef14715ccfb63d415f03d8dd334f' 
  AND token = '5b78YKVTGNQOM3jRZD2LuOezHAaVCKZBsO2yzJKspbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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