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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57cd7ea6a89329f463359c037ffadc216bedba954bd46e44909e577add8378cc' 
  AND token = '9rNY7EnFVQjMw7LuUETLA6JdLrwwlSvWdU4hzt+F1GA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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