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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '488500e9d43b297e9ca2a0e1c316585ce12dc8617daafae6f59fecae0ace8ebb' 
  AND token = '/famIcfbMNT8O1Aygm4CaHJdueLZmpoEoLI9GnCDA2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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