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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6542da046dbc4d5fe005eb37e172cd1d9eb19690cdf1e2501e831bc3749b3624' 
  AND token = '3DXoFwnhT8XGV6Y/6Azi0nAfpSOT8zOEkZre7ScLess=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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