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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bee9cf5c11c6ae0ce16c816ca4bce18141a8ca8bb4fe358fb6edbba5e1d81bf' 
  AND token = 'JEM1elNKEYBgELa1eB3JI89sj7q3zeawA/SNS+5t1MQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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